/** This is where the ghost image is drawn */
public void dragOver(final DropTargetDragEvent e) {
if ((e == null)
|| (_raGhost == null)
|| (_ptLast == null)
|| (_ptOffset == null)
|| (_imgGhost == null)
|| (_raCueLine == null)) return;
// Even if the mouse is not moving, this method is still invoked 10 times per second
final Point pt = e.getLocation();
if (pt == null) return;
if (pt.equals(_ptLast)) return;
// Try to determine whether the user is flicking the cursor right or left
final int nDeltaLeftRight = pt.x - _ptLast.x;
if (((_nLeftRight > 0) && (nDeltaLeftRight < 0))
|| ((_nLeftRight < 0) && (nDeltaLeftRight > 0))) _nLeftRight = 0;
_nLeftRight += nDeltaLeftRight;
_ptLast = pt;
final Graphics2D g2 = (Graphics2D) getGraphics();
if (g2 == null) return;
// If a drag image is not supported by the platform, then draw my own drag image
if (!DragSource.isDragImageSupported()) {
JDragTree.this.paintImmediately(
_raGhost.getBounds()); // Rub out the last ghost image and cue line
// And remember where we are about to draw the new ghost image
_raGhost.setRect(
pt.x - _ptOffset.x, pt.y - _ptOffset.y, _imgGhost.getWidth(), _imgGhost.getHeight());
g2.drawImage(
_imgGhost,
AffineTransform.getTranslateInstance(_raGhost.getX(), _raGhost.getY()),
null);
} else // Just rub out the last cue line
JDragTree.this.paintImmediately(_raCueLine.getBounds());
final TreePath path = getClosestPathForLocation(pt.x, pt.y);
if (!(path == _pathLast)) {
_nLeftRight = 0; // We've moved up or down, so reset left/right movement trend
_pathLast = path;
_timerHover.restart();
}
// In any case draw (over the ghost image if necessary) a cue line indicating where a drop
// will occur
final Rectangle raPath = getPathBounds(path);
_raCueLine.setRect(0, raPath.y + (int) raPath.getHeight(), getWidth(), 2);
g2.setColor(_colorCueLine);
g2.fill(_raCueLine);
// And include the cue line in the area to be rubbed out next time
_raGhost = _raGhost.createUnion(_raCueLine);
// Do this if you want to prohibit dropping onto the drag source
if (path.equals(_pathSource)) e.rejectDrag();
else e.acceptDrag(e.getDropAction());
}
public void dragGestureRecognized(DragGestureEvent evt) {
if (files == null) return;
if (files.length <= 0) {
return;
}
Icon icn = files[0].getIcon(false);
Toolkit tk = Toolkit.getDefaultToolkit();
if (icn == null) icn = new EmptyIcon();
Dimension dim = tk.getBestCursorSize(icn.getIconWidth(), icn.getIconHeight());
// set up drag image
if (DragSource.isDragImageSupported()) {
BufferedImage buff =
new BufferedImage(dim.width + 100, dim.height, BufferedImage.TYPE_INT_ARGB);
Graphics graphics = buff.getGraphics();
Color color = graphics.getColor();
icn.paintIcon(null, graphics, 0, 0);
graphics.setColor(color);
graphics.setColor(Color.RED);
graphics.drawString(files.length + " Elements", icn.getIconWidth(), dim.height / 2);
try {
evt.startDrag(
DragSource.DefaultCopyDrop,
buff,
new Point(0, 0),
new FileTransferable(files, table.getTableModel()),
this);
} catch (IOException ex) {
Logger.getLogger(FileDragGestureListener.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
BufferedImage buff = new BufferedImage(dim.width, dim.height, BufferedImage.TYPE_INT_ARGB);
Graphics graphics = buff.getGraphics();
icn.paintIcon(null, graphics, 0, 0);
try {
cursor = tk.createCustomCursor(buff, new Point(0, 0), "tempcursor");
evt.startDrag(
cursor,
null,
new Point(0, 0),
new FileTransferable(files, table.getTableModel()),
this);
} catch (IOException ex) {
Logger.getLogger(FileDragGestureListener.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
public void dragExit(final DropTargetEvent e) {
if (!DragSource.isDragImageSupported()) {
JDragTree.this.repaint(_raGhost.getBounds());
}
}